add system act type enum

system-act-type.py

@@ -0,0 +1,20 @@
+from enum import Enum, unique
+
+
+@unique
+class SystemActType(Enum):
+    affirm = 0,
+    bye = 1,
+    confirm_domain = 2,
+    negate = 3,
+    repeat = 4,
+    reqmore = 5,
+    welcomemsg = 6,
+    canthelp = 7,
+    canthelp_missing_slot_value = 8,
+    expl_conf = 9,
+    impl_conf = 10,
+    inform = 11,
+    offer = 12,
+    request = 13,
+    select = 14